I seem to remember reading here that someone with allergies had requested a small air purifier for their room and it wasn't a problem. My DS9 has allergy/asthma issues and I have bad allergies...at home, we have HEPA filter purifiers in all bedrooms. I was wondering if this is something we could indeed ask for at check-in? I know our's are huge and weigh a ton, so it wouldn't be feasible to pack them!!! Thanks! Karla B.